Terrible After Service

I have had a new aircon installed about a month an a half ago. 2 weeks later the aircon hasn't been working properly so I requested a technician to be sent out to see what the problem is. It's a month later and I'm still waiting. The continously send me messages to say that someone is on their way however no one arrives... I will never use them again. I would rather spend more with a realibe company knowing that I would get a proper service after installation. They make promises that they cannot honor.. its a disgrace